CustomAdapter

    public class CustomAdapter extends ArrayAdapter<CustomItem> {

        private final Context context;
        private final ArrayList<CustomItem> mItemsArrayList;
        private CustomFragment mFragment;


        public CustomAdapter(Context context, ArrayList<CustomItem> itemsArrayList, CustomFragment fragment) {

            super(context, R.layout.watch_list_row, itemsArrayList);

            this.context = context;
            this.mItemsArrayList = itemsArrayList;
            this.mFragment = fragment;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final int pos = position;
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            final View rowView = inflater.inflate(R.layout.watch_list_row, parent, false);

            final ImageView popupButton = (ImageView) rowView.findViewById(R.id.imgPopUp);
            popupButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    PopupMenu popup = new PopupMenu(context, popupButton);
                    //Inflating the Popup using xml file
                    popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());

                    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                        public boolean onMenuItemClick(MenuItem item) {
                            int i = item.getItemId();
                            return onMenuItemClick(item);
                        }
                    });
                    popup.show();//showing popup menu
                }
            });
            return rowView;
        }
    }